Super Bowl fans never knew it, but police video cameras focused on their faces, one by one, as they streamed through the turnstiles in Tampa on Sunday. Cables instantly carried the images to computers, which spent less than a second comparing . . .
Super Bowl fans never knew it, but police video cameras focused on their faces, one by one, as they streamed through the turnstiles in Tampa on Sunday. Cables instantly carried the images to computers, which spent less than a second comparing them with thousands of digital portraits of known criminals and suspected terrorists.

But the decision to scan the unwitting crowd at the Super Bowl and countless visitors to the popular entertainment district of Ybor City for days before the big game inspired support and opposition yesterday over the nature of the technology and its intended uses.

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